IMPROVEMENT OF INDUCTION EQUIPMENT FOR DIFFERENTIATED HEAT TREATMENT OF WELDED JOINTS OF RAILS
DOI:
https://doi.org/10.32339/0135-5910-2024-12-23-30Keywords:
rails, welded joints, thermal impact zone, contact welding, sprayerAbstract
in hardness in the joint on both sides and the formation of a favorable diagram of internal residual stresses (compressing in the head The paper analyzes the current state of the problem of crumpling welded joints of rails on the Russian railway network. In order to radically solve the problem of improving the quality of the joint, reducing structural heterogeneity and creating uniformity in hardness along the entire length of welded rails, comprehensive research has been carried out and the fundamental principles of manufacturing technology for welded rail lashes by continuous sequential volumetric induction heating with compressed air cooling have been developed. It is shown that compressed air with controlled humidity can be used to create a controlled cooling rate system. The development of the fundamental principles for the manufacture of welded rail lashes during heat treatment along the entire length is an urgent scientific and practical task. The description of modern air-cooled induction equipment used both in Russia and in other countries is presented. The equipment used in the Russian Federation is studied in detail – an induction heating installation (UIN) and a sprayer used in it for one-way supply of compressed air. The induction equipment for differentiated heat treatment of welded joints of rails has been improved with the introduction of a modified compressed air cooling spray. The introduction of a two-way joint cooling system on an upgraded installation ensures an increase and sole and compensating stretching in the neck), which will positively affect the fatigue strength of the rail in the area of the welded joint. Such a stress diagram best corresponds to the loading of the joint in operation. To confirm this assumption, the installation was tested and the data obtained were analyzed after local heat treatment with one-sided and two-sided cooling schemes. Together with the research laboratory of PJSC “CHMK”, Chelyabinsk, a modernized induction installation of the UIN type was tested at the Rail Welding Enterprise No. 13 in Chelyabinsk-001-100/RT-C with a two-way cooling circuit.
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